From a91e59e4a0fa9cbc6c662feaad6ac17b0f07ce9a Mon Sep 17 00:00:00 2001
From: David Buhler <david.buhler@myheat.ca>
Date: Mon, 20 Feb 2023 12:31:03 -0700
Subject: [PATCH] Fixed #34344 -- Allowed PostGIS DatabaseWrapper subclasses to
 customize (features/introspection/ops)_class classes.

---
 .../contrib/gis/db/backends/postgis/base.py   | 22 +++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/django/contrib/gis/db/backends/postgis/base.py b/django/contrib/gis/db/backends/postgis/base.py
index 23ec0553f82..8360c0e19a1 100644
--- a/django/contrib/gis/db/backends/postgis/base.py
+++ b/django/contrib/gis/db/backends/postgis/base.py
@@ -2,6 +2,15 @@ from functools import lru_cache
 
 from django.db.backends.base.base import NO_DB_ALIAS
 from django.db.backends.postgresql.base import DatabaseWrapper as PsycopgDatabaseWrapper
+from django.db.backends.postgresql.features import (
+    DatabaseFeatures as PsycopgDatabaseFeatures,
+)
+from django.db.backends.postgresql.introspection import (
+    DatabaseIntrospection as PsycopgDatabaseIntrospection,
+)
+from django.db.backends.postgresql.operations import (
+    DatabaseOperations as PsycopgDatabaseOperations,
+)
 from django.db.backends.postgresql.psycopg_any import is_psycopg3
 
 from .adapter import PostGISAdapter
@@ -81,6 +90,9 @@ if is_psycopg3:
 
 class DatabaseWrapper(PsycopgDatabaseWrapper):
     SchemaEditorClass = PostGISSchemaEditor
+    features_class = DatabaseFeatures
+    ops_class = PostGISOperations
+    introspection_class = PostGISIntrospection
 
     _type_infos = {
         "geometry": {},
@@ -89,11 +101,13 @@ class DatabaseWrapper(PsycopgDatabaseWrapper):
     }
 
     def __init__(self, *args, **kwargs):
+        if kwargs.get("alias", "") == NO_DB_ALIAS:
+            # Don't initialize PostGIS-specific stuff for non-db connections.
+            self.features_class = PsycopgDatabaseFeatures
+            self.ops_class = PsycopgDatabaseOperations
+            self.introspection_class = PsycopgDatabaseIntrospection
+
         super().__init__(*args, **kwargs)
-        if kwargs.get("alias", "") != NO_DB_ALIAS:
-            self.features = DatabaseFeatures(self)
-            self.ops = PostGISOperations(self)
-            self.introspection = PostGISIntrospection(self)
 
     def prepare_database(self):
         super().prepare_database()